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Flight crew of an medium large transport made a missed approach due to false GS indications causing a higher minimum descent altitude which resulted in not breaking out of overcast to see the runway. The ATIS WX information and tower had reported a higher overcast condition. The reporter also suspected GS indication interference by aircraft crossing runway.
| Attributes | |
| ACN | 396980 |
| Time | |
| Date | 199803 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cle |
| State Reference | OH |
| Altitude | agl bound lower : 500 agl bound upper : 500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : cle |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : cfi pilot : atp pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 700 |
| ASRS Report | 396980 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
Approach for ILS runway 5R cle. Vector of 030 degrees changed to 020 degree heading for LOM. Turning on localizer and starting down GS, started receiving erroneous signals GS (full case up to full case down). We elected to continue approach as localizer only. Informed tower of erroneous signals and asked if aircraft were crossing runway, causing problem. At this point we were at approximately 500 ft AGL and at missed approach for localizer approach. Tower asked if we were going to land. We stated we were going around. Tower said climb and maintain 4000 ft. I requested and received runway heading to 4000 ft. Tower shortly turned us to heading 320 degrees. Tower reported ceiling at 900 ft, visibility 5 mi (at 500 ft we did not have ground contact). ATIS WX report at 1100 ft and 6 mi. The previous day we received erroneous GS signals because aircraft in critical area.
Original NASA ASRS Text
Title: FLC OF AN MLG MADE A MISSED APCH DUE TO FALSE GS INDICATIONS CAUSING A HIGHER MINIMUM DSCNT ALT WHICH RESULTED IN NOT BREAKING OUT OF OVCST TO SEE THE RWY. THE ATIS WX INFO AND TWR HAD RPTED A HIGHER OVCST CONDITION. THE RPTR ALSO SUSPECTED GS INDICATION INTERFERENCE BY ACFT XING RWY.
Narrative: APCH FOR ILS RWY 5R CLE. VECTOR OF 030 DEGS CHANGED TO 020 DEG HDG FOR LOM. TURNING ON LOC AND STARTING DOWN GS, STARTED RECEIVING ERRONEOUS SIGNALS GS (FULL CASE UP TO FULL CASE DOWN). WE ELECTED TO CONTINUE APCH AS LOC ONLY. INFORMED TWR OF ERRONEOUS SIGNALS AND ASKED IF ACFT WERE XING RWY, CAUSING PROB. AT THIS POINT WE WERE AT APPROX 500 FT AGL AND AT MISSED APCH FOR LOC APCH. TWR ASKED IF WE WERE GOING TO LAND. WE STATED WE WERE GOING AROUND. TWR SAID CLB AND MAINTAIN 4000 FT. I REQUESTED AND RECEIVED RWY HDG TO 4000 FT. TWR SHORTLY TURNED US TO HDG 320 DEGS. TWR RPTED CEILING AT 900 FT, VISIBILITY 5 MI (AT 500 FT WE DID NOT HAVE GND CONTACT). ATIS WX RPT AT 1100 FT AND 6 MI. THE PREVIOUS DAY WE RECEIVED ERRONEOUS GS SIGNALS BECAUSE ACFT IN CRITICAL AREA.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.